JP2002147678A - Header, and joining structure of header and piping material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lightweight header of high workability capable of replacing only a header part or a piping material joined to the header, and to provide a joining structure of the header and the piping material. SOLUTION: An inserting part formed on one end of the piping material is internally fitted to a branch pipe part of the header made of a resin, and the piping material is joined to the branch pipe part of the header in a state that a packing interposed between a tip face of the branch pipe part and a contract face of a flange of the piping material is water-tightly held by fastening a bolt hung between a loose flange mounted on the branch pipe part of the header, and the flange of the piping material opposite to the loose flange.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a header and a connection structure between the header and a piping material.

[0002]

2. Description of the Related Art A conventional header and a pipe material such as a pipe connection joint connected to a branch pipe portion of the header are formed by winding a sealing tape or the like around a pipe taper screw of JIS B0203 provided at the tip of the pipe material. In such a state, it was screwed into the branch pipe for connection. However, in this connection structure,
The screwing requires time and labor, and simplification of the connection structure is required. In addition, in the case of resin headers that are becoming increasingly popular recently because of their light weight and excellent workability, a great deal of stress is generated in the threaded portion when screwed in, and thus there is a problem in terms of strength.

In the case of a resin header, Japanese Patent Laid-Open No.
Although a joining method by fusion is carried out as disclosed in Japanese Patent No. 253084, in the case of joining by fusion, the header and the piping material are completely integrated, so that the header or the piping material side is used. In the case where replacement is required for either one of them, replacement of both the header and the piping material is required. Therefore, the work scale at the time of replacement increases, and the number of replacement members increases, which is uneconomical.

[0004]

SUMMARY OF THE INVENTION In view of such circumstances, the present invention provides a header which is lightweight, has good workability, and can be replaced only with a header portion or only a piping material connected to the header, and a header for the header. It is an object of the present invention to provide a joint structure between a used header and a piping material.

[0005]

In order to achieve such an object, a header according to the first aspect of the present invention (hereinafter referred to as a "header of the first aspect").
In a header formed of a synthetic resin having a header main pipe part and a branch pipe part extending from a side wall surface of the header main pipe part, a ring-shaped concave groove is formed on the peripheral surface of the tip part of the branch pipe part. And a loose flange is loosely fitted in the concave groove.

[0006] The header according to the second aspect of the present invention (hereinafter referred to as "the header of the second aspect").
In the header of the first aspect, the loose flange is formed from two decomposable pieces having a semicircular arc shape.

[0007] The header according to the third aspect of the present invention (hereinafter referred to as "the header of the third aspect").
In the header according to claim 1 or 2, a screw into which a cap nut for fixing a joint for connection, which is screwed into the loose flange from the distal end side of the branch pipe portion, is provided.

[0008] A header according to the present invention according to claim 4 of the present invention (hereinafter referred to as "header of claim 4").
Is a header formed of a synthetic resin having a header main pipe part and a branch pipe part extending from a side wall surface of the header main pipe part, wherein the branch pipe part has a flange at a tip end thereof. The corner of the flange on the header main pipe side is chamfered in a tapered shape.

A header according to the present invention according to claim 5 of the present invention (hereinafter, referred to as “header of claim 5”)
In a header including a header main pipe part and a branch pipe part extending from a side wall surface of the header main pipe part, when the header main body part is resin-molded, its flange side is the tip of the branch pipe part. The branch pipe portion was formed by insert-molding a flanged metal tubular member into a resin header main pipe portion.

[0010] A header according to the present invention according to claim 6 of the present invention (hereinafter referred to as "header of claim 6").
In a header including a header main pipe section and a branch pipe section extending from a side wall surface of the header main pipe section, a metal tubular member having a screw engraved on one end outer peripheral surface has the screw as a tip. The branch pipe portion is formed by insert-molding the resin main header portion so as to be exposed to the outside.

[0011] According to a seventh aspect of the present invention, there is provided a connection structure between a header and a piping material (hereinafter referred to as a "connection structure of the seventh aspect"). A bolt tightened inside the branch pipe portion of the header according to claim 1 or 2 and passed between a loose flange of the header and a flange of piping material provided so as to face the loose flange. The pipe material is connected to the branch pipe portion of the header in a state where the packing interposed between the tip surface of the branch pipe portion and the contact surface of the flange of the pipe material is watertightly clamped.

The connection structure between the header and the piping material according to the invention of claim 8 of the present invention (hereinafter referred to as "connection structure of claim 8") has an insertion portion provided at one end of the piping material. Along with being fitted inside the branch pipe portion of the header according to claim 3 and being rotatably fitted outside the piping material,
A cap nut, which is locked to a flange of the piping material arranged to face the loose flange of the header, is screwed into the screw of the loose flange, and the screwing causes the tip end surface of the branch pipe portion of the flange of the piping material. The piping material was connected to the branch pipe portion of the header in a state where the packing provided on the contact surface was sandwiched in a watertight manner.

According to the ninth aspect of the present invention, a connection structure between a header and a piping material according to the invention of the ninth aspect (hereinafter referred to as a "connection structure of the ninth aspect") is the same as that of the seventh or eighth aspect. In the fitting state to the branch pipe portion, a groove is formed in a ring shape on the peripheral surface of the insertion portion on the header main pipe side side from the loose flange, and packing is mounted in this groove.

According to the tenth aspect of the present invention, a connection structure between a header and a piping material according to the tenth aspect of the present invention (hereinafter referred to as “claim 1
0 connection structure ") is a pipe member having an insertion portion provided at one end, and a flange having a tapered chamfer at a corner of a surface opposite to the insertion portion at a base end of the insertion portion. And the header according to claim 4, wherein the insertion portion is fitted inside the branch pipe portion, and the flange of the pipe material and the flange of the branch pipe portion are in close contact with each other, and have a substantially ring shape. Equipped with a locking part that bends inward at both edges of the band body at an angle along the chamfered surfaces of both flanges, and a fixed band that expands and contracts the band body diameter by tightening the tightening screw is attached so as to surround both flanges The pipe member is connected to the branch pipe portion of the header by reducing the diameter by tightening the tightening screw and pressing the locking portion against the chamfered surfaces of both flanges.

According to the eleventh aspect of the present invention, a connection structure between a header and a piping material according to the invention of the eleventh aspect (hereinafter referred to as “claim 1
1) has a plug portion provided at one end, and a pipe member provided with a flange at a base end portion of the plug portion and the header according to claim 5 are connected to the branch pipe portion. The insertion portion is fitted inside, and the flange of the pipe material and the flange of the branch pipe portion are in close contact with each other, and the diameter is enlarged and reduced by unfastening the tightening screw so that both flanges are sandwiched. In a state in which the fitting provided with the engaging portion to be disposed on the peripheral portion is mounted so as to surround both flanges and sandwich the both flanges by the engaging portion, the pipe material is attached to the branch pipe portion of the header. It was configured to be connected.

A connection structure between a header and a piping material according to the invention according to claim 12 of the present invention (hereinafter referred to as “Claim 1
2), the insertion portion provided at one end of the pipe material is fitted inside the branch pipe portion of the header according to claim 6 and is rotatably fitted outside the pipe material. A cap nut, which is locked to a flange of a pipe member disposed so as to face the tip end surface of the branch pipe portion of the header, is screwed into a screw of the branch pipe portion, so that the pipe member is connected to the branch pipe of the header. Section.

A connection structure between a header and a pipe member according to the invention according to claim 13 of the present invention (hereinafter referred to as “Claim 1
In the connection structure of (3), a joint for connecting pipes is used as a pipe material in the connection structure of claims 7 to 12.

In the present invention, the resin constituting the header is not particularly limited, but a crosslinked thermoplastic resin such as crosslinked polyethylene or crosslinked polypropylene or polybutene having excellent heat resistance, creep resistance and mechanical strength is preferably used. Is done.

In the header of the first aspect, the loose flange may be insert-molded when the header is injection-molded, but in consideration of moldability and handleability, the loose flange is divided into two parts. It is preferable to make it detachable. Examples of the material of the loose flange include a metal, a composite material of a metal and a resin, and an engineering plastic. A metal such as cast iron is generally used.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
This will be described in detail with reference to the drawings. 1 and 2 show a first embodiment of a header according to the present invention and a connection structure between the header and a piping material.

As shown in FIG. 1, this header 1a
Made of cross-linked polyethylene, the header main part 1
Three branch pipe portions 12a are provided to protrude in the same direction from the side wall surface of 1a. The header 1a is provided with a spigot 13 at one end of the header main pipe portion 11a, and a receptacle 14 at the other end. Sealed by fusing. A groove 15 is provided on the peripheral surface of the branch pipe portion 12a, and the metal loose flange 2a is loosely fitted in the groove 15.

As shown in FIG. 2, the loose flange 2a is provided with four screw holes 21 and is formed from two divided pieces 22 in a semicircular shape. After the injection molding, the two divided pieces 22 and 2
By fitting the two end faces of the fitting pins 23 into the fitting holes provided in the both end faces and fitting the two end portions of the fitting pins 23, the assembly 2 is disassembled and is loosely fitted in the concave groove 15. ing.

The header 1a is configured such that a pipe connecting joint 3a as a piping material shown in FIG. 1 is connected to the branch pipe portion 12a as follows.

That is, as shown in FIG. 1, the joint 3a has an insertion portion 31 at one end, a pipe attachment portion 32 at the other end to which a pipe can be fitted and connected, and a header 1 at an intermediate portion.
A has a flange 33a having substantially the same outer diameter as the loose flange 2a and having a bolt insertion hole 34. A branch pipe portion 12a is provided on the outer peripheral surface of the insertion portion 31.
In the fitted state, a concave groove 35 is formed in a ring shape on the header main pipe portion 11a side from the loose flange 2a, and an O-ring 36 is mounted in this concave groove 35 as a packing. A packing fitting groove 37 is formed in the end face of the flange 33a on the header 1a side. The packing fitting concave groove 37 is provided at the end of the flange 33a.
Is formed in a ring shape having a diameter smaller than the inner diameter of the loose flange 2a at a portion corresponding to the end face of the ring-shaped packing 3.
8 is fitted.

The joint 3a is inserted into the insertion portion 31.
Into the branch pipe portion 12a and the flange 33a.
The tightening bolt 5 is screwed into the screw hole 21 of the loose flange 2a through the bolt insertion hole 34, thereby being fixed to the branch pipe portion 12a.

According to this connection structure, as described above, the joint 3a is fixed to the branch pipe portion 12a by screwing the tightening bolt 5 into the screw hole 21 of the loose flange 2a through the bolt insertion hole 34 of the flange 33a. It is supposed to be. That is, the joint 3a can be fixed without screwing into the header 1a. In general, when an internal pressure acts on the header, when the resin is made of resin, the branch pipe portion 12a undergoes creep expansion, so that the water blocking performance of the packing of the insertion portion 31 decreases over a long term.
The expansion flange a is prevented by the loose flange 2a, and the concave groove 35 in which the O-ring 36 is mounted is provided on the header main pipe portion 11a side from the loose flange 2a. Can be secured for a long time.

Moreover, if the fastening bolt 5 is removed,
Since the joint 3a can be easily removed from the header 1a, even when the header 1a or the joint 3a is defective, only the defective part needs to be replaced, which is economical and requires a small work range. Also, header 1
Since a is made of only resin, it is lightweight and has good workability. In addition, the loose flange 2a has two divided pieces 22.
Can be mounted on the header 1a by assembling, so that the mold structure of the header can be simplified and the manufacturing cost can be reduced as compared with the case where insert molding is performed on the header 1a.

FIGS. 3 to 5 show a second embodiment of a header according to the present invention and a connection structure between the header and a piping material. As shown in FIGS. 3 and 4, the header 1b is provided with a parallel screw 24 intermittently on the surface of the loose flange 2b on the distal end side of the branch pipe, and at one end of the header main pipe 11b. The header 1a is the same as the header 1a except that the receiving port 14 is not provided and is closed during molding.

In the header 1b, a joint 3b as a piping material shown in FIG. 3 is connected to the branch pipe portion 12a as follows. That is, the joint 3b
As shown in the figure, the joint 3a is the same as the joint 3a, except that the cap nut 6 is provided so as to be engaged with the flange 33b, and the bolt insertion hole 34 is not provided in the flange 33b. The cap nut 6 is shown in FIG.
As shown in FIG. 5, teeth 61 engaging with the parallel screw 24 of the loose flange 2b are provided intermittently at intervals substantially equal to or slightly longer than the length of the parallel screw 24.

The joint 3b is inserted into the insertion portion 31.
Are fitted into the branch pipe portion 12a, and the teeth 61 of the cap nut 6 are engaged with the parallel screw 24 of the loose flange 2b to be fixed to the branch pipe portion 12a of the header 1b. Since the header 1b and its connection structure are as described above, the same effects as those of the header 1a and its connection structure are provided.

FIGS. 6 and 7 show a third embodiment of a header according to the present invention and a connection structure between the header and a piping material. As shown in FIG. 6, the header 1c is provided with a flange 18 at the distal end of the branch pipe portion 12c, and the header main pipe portion 11 of the flange 18 is provided.
Except that the c-side surface is chamfered in a tapered shape and no loose flange is provided,
It is the same as b.

In the header 1c, a joint 3c as a piping material shown in FIG. 6 is connected and fixed to a branch pipe portion 12c as follows using a fixing band 7a as shown in FIG. .

That is, as shown in FIG. 1, the joint 3c has the same structure as the joint 3b except that the corner of the surface of the flange 33c opposite to the insertion portion 31 is chamfered in a tapered shape.
Is similar to On the other hand, as shown in FIG. 7, the fixed band 7a includes a band main body 71 and locking portions 72, 72. The band main body 71 has two flanges 18, 33.
A ring having an inner circumferential length slightly shorter than the circumferential length of c is partially cut so as to be expandable, and is provided on the protruding portions 73, 73 extending from both end edges of the cut portion to the outside of the ring. Tightening bolts (not shown) are inserted into the screw holes 74, 74. The locking portion 72 is attached to the band body 7.
1 are formed so as to be bent at an angle along the chamfered portions 18 ', 33c' of the flanges 18, 33c from the both end edges to the inside of the ring.

Then, with the insertion portion 31 fitted into the branch pipe portion 12c until the flange 33c is in close contact with the flange 18, the band main body 71 is formed at the protrusions 73, 73.
In a state where the diameter of the joint 3c is expanded to extend from the tip of the joint 3c to the portions of the two flanges 18 and 33c so that the band main body 71 surrounds the two flanges 18 and 33c. Next, a fastening bolt (not shown) is passed through the screw holes 74, 74, and a nut (not shown) disposed on the opposite side.
Into the protruding part 7 by the head of the bolt and the nut.
The joint 3c is fixed to the header 1c by reducing the diameter of the band main body 71 with the 3, 73 sandwiched therebetween.

That is, according to this connection structure, the engaging portions 72, 72 are pressed against the chamfered portion 18 'of the flange 18 and the chamfered portion 33c' of the flange 33c, so that the joint surfaces of the flanges 18, 33c are firmly adhered. I do. And
The band main body 71 suppresses the expansion of the branch pipe portion 12b, and the sealing performance of the O-ring 36 can be ensured for a long time. Also, since the header 1c and its connection structure are as described above, the same effects as those of the header 1a and its connection structure are provided.

FIG. 8 shows a fourth embodiment of a header according to the present invention and a connection structure between the header and a piping material. As shown in FIG. 8, this header 1d
Is the same as the header 1a except that the branch pipe portion 12d having the flange 19 at the tip is formed by insert-molding the metal tubular member 8a with a flange when the header main pipe portion 11d is injection-molded. It has become.

The header 1d is configured as described above, and the joint 3d shown in FIG. 8 is connected and fixed to the branch pipe portion 12d using a fixing band (locking clip) 7b as follows. Has become. That is, the joint 3d is
It is the same as the joint 3c except that the connecting portion 32 'of the pipe P has a different shape. Also, the fixed band 7b
Is the fixing band 7a except that it has a U-shaped cross section.
Is similar to

Then, as shown in FIG.
With the insertion part 31 fitted into the branch pipe part 12d until the c is in close contact with the flange 19, the fixed band 7b is pushed out at the cut part (not shown) to expand the diameter, and the distal end of the joint 3d. Through the two flanges 19, 33c to the inside of the U-shape of the fixing band 7b.
3c is fitted. Next, a tightening bolt (not shown) is passed through a screw through hole (not shown) and screwed into a nut (not shown) arranged on the opposite side, and a protrusion (not shown) is formed by the head of the bolt and the nut. 3d), the joint 3d is fixed to the header 1d by reducing the diameter of the fixing band 7b.

That is, according to this connection structure, since the branch pipe portion 12d is formed of metal, it is possible to maintain the sealing performance for a long time even when used under a high temperature. Also, even if a large external force acts during construction and use due to the fixed band 7b and local stress is generated,
Withstand enough. Of course, the header 1d and its connection structure have the same effects as those of the above-described embodiment.

The fixing band is not particularly limited. For example, a fixing band 7c having a slit 76 as shown in FIG. 9 can be used.

FIG. 10 shows a fifth embodiment of the header according to the present invention and a connection structure between the header and a piping material. As shown in FIG.
e is a metal tubular member 8b in which a branch pipe portion 12e is provided in place of the metal tubular member 8a and a screw 82 is engraved on an outer peripheral surface at one end.
Is formed in the same manner as the above-mentioned header 1d except that the screw 82 is formed by insert-molding the resin header main pipe portion 11e so that the screw 82 is exposed to the outside.

The header 1e is configured as described above, and the same joint 3d as in the fourth embodiment is connected and fixed to the branch pipe portion 12e using the cap nut 9 as follows. It has become. That is, the flange 33
With the insertion portion 31 fitted in the branch pipe portion 12c until d comes in close contact with the flange 19, the cap nut 9 is screwed into the screw 82 to connect and fix the joint 3d to the branch pipe portion 12e. ing.

According to this connection structure, the same effects as those of the fourth embodiment can be obtained.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the number of the branch pipes is three, but the number may be two or four or more.
Further, the protruding directions of the branch pipe portions may be individually different. Further, in the header 1a of the first embodiment, the receiving port 14 is closed with the cap. However, the receiving port 14 may be closed or closed, and another pipe may be connected to the receiving port. It does not matter.

[0045]

Since the header according to the present invention is constructed as described above, it is lightweight and excellent in handleability. In addition, the connection structure of the present invention enables a pipe material such as a joint to be detachably mounted. That is, according to the connection structure of the present invention, by using the header of the present invention, when either the header or the piping material is defective, only the defective member can be replaced, which is economical. . In addition, the work range is small and the workability of the replacement work is excellent.

According to the header of the second aspect, the header can be formed easily and at low cost. In addition, according to the header of the fifth and sixth aspects, the heat resistance of the branch pipe portion is increased, and the sealing property between the insertion portion of the pipe material and the branch pipe portion can be secured for a long time. At the same time, stable sealing can be ensured even after a pipe change in the event of a trouble.

Further, according to the connection structure of the ninth aspect, the waterproofness of the insertion portion is improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a header and a connection structure between the header and a pipe member according to the present invention.

FIG. 2 is a plan view of a loose flange of the header of FIG. 1;

FIG. 3 is a sectional view showing a twenty-first embodiment of a header according to the present invention and a connection structure between the header and a pipe member.

FIG. 4 shows a loose flange of the header of FIG. 3,
FIG. 1A is a plan view thereof, and FIG. 1B is a front view thereof.

5A and 5B show a cap nut used in the connection structure of FIG. 3, wherein FIG. 5A is a sectional view and FIG. 5B is a bottom view.

FIG. 6 is a cross-sectional view illustrating a header according to a third embodiment of the present invention and a connection structure between the header and a pipe member.

7A and 7B show a fixing band used in the connection structure shown in FIG. 6, wherein FIG. 7A is a plan view and FIG. 7B is a front view.

FIG. 8 is a partial cutaway sectional view of a main part of a header and a connection structure between the header and a pipe according to a fourth embodiment of the present invention.

FIG. 9 is a perspective view showing another embodiment of the fixing band used in the connection structure of FIG.

FIG. 10 is a partial cutaway cross-sectional view of a main part of a fifth embodiment of a header and a connection structure between the header and a piping material according to the present invention.

[Explanation of symbols]

1a, 1b, 1c, 1d, 1e Header 11a, 11b, 11c, 11d, 11e Header main part 12a, 12b, 12c, 12d, 12e Branch pipe part 15 Recessed groove 18 'Chamfered surface 2a, 2b Loose flange 22 Split piece 24 Screw (Loose Flange 2b) 3a, 3b, 3c, 3d Joint (Piping Material) 31 Insertion Part 33a, 33b, 33c Flange 33c 'Chamfer Surface 35 Groove 36 O-Ring (Packing) 5 Bolt 7a, 7b, 7c Fixed Band 71 Band body 72 Locking part 6, 9 Cap nut

Claims (13)

[Claims] 1. A header formed of a synthetic resin having a header main pipe part and a branch pipe part extending from a side wall surface of the header main pipe part. A header, wherein a concave groove is formed, and a loose flange is loosely fitted in the concave groove. The loose flange has a semicircular arc-shaped disassembly.
2. The header of claim 1, wherein the header is formed from two pieces. 3. The resin header according to claim 1, wherein a screw for screwing a cap nut for fixing a connection joint to be screwed into the loose flange from the tip end of the branch pipe portion is provided. 4. A header formed of a synthetic resin having a header main pipe section and a branch pipe section extending from a side wall surface of the header main pipe section, wherein the branch pipe section has a flange at a tip end thereof. A header characterized in that a corner of the flange on the header main pipe side is chamfered in a tapered shape. 5. A header comprising a header main pipe part and a branch pipe part extending from a side wall surface of the header main pipe part. A header characterized in that a branch pipe portion is formed by insert-molding a flanged metal tubular member into a resin header main pipe portion. 6. A header comprising a header main pipe part and a branch pipe part extending from a side wall surface of the header main pipe part, wherein a metal tubular member having a thread engraved on an outer peripheral surface at one end thereof is provided.
A header characterized in that a branch pipe portion is formed by insert molding the resin header main pipe portion so as to be exposed outside with the screw as a tip. 7. An insertion portion provided at one end of a pipe member is fitted in the branch pipe portion of the header according to claim 1 or 2, and faces the loose flange of the header and the loose flange. In the state where the packing interposed between the tip surface of the branch pipe portion and the contact surface of the flange of the piping material is watertightly clamped by tightening bolts that are bridged between the flanges of the piping material provided in, Connection structure between the header and the piping material, where the piping material is connected to the branch pipe section of the header. 8. An insertion portion provided at one end of the piping material is fitted inside the branch pipe portion of the header according to claim 3, and is rotatably fitted externally to the piping material, and a loose flange of the header is provided. A cap nut, which is locked to a flange of the piping material arranged so as to face the screw, is screwed into the screw of the loose flange, and the screwing causes the flange of the piping material to come into contact with the tip end surface of the branch pipe portion. A connection structure between the header and the piping material in which the piping material is connected to the branch pipe portion of the header in a state where the provided packing is sandwiched in a watertight manner. 9. A groove is formed in a ring shape on the peripheral surface of the insertion portion on the header main tube side from the loose flange when fitted to the branch tube portion, and packing is mounted in the groove. A connection structure between the header and the piping material according to claim 7. 10. A pipe member having an insertion portion provided at one end, and a flange provided at a base end of the insertion portion with a flange having a tapered chamfered corner on a surface opposite to the insertion portion.
5. A substantially ring-shaped band main body, wherein the header according to claim 4 is such that the insertion portion is fitted in the branch pipe portion, and the flange of the pipe material and the flange of the branch pipe portion are in close contact with each other. A locking band that is bent inward at an angle along the chamfered surfaces of both flanges at both peripheral edges of the band is attached so as to surround the two flanges, and a fixed band whose diameter of the band body expands and contracts by unfastening the tightening screw, The connection structure between the header and the pipe material, in which the pipe material is connected to the branch pipe portion of the header by reducing the diameter by tightening the tightening screw and pressing the locking portion against the chamfered surfaces of both flanges. . 11. A pipe member having an insertion portion provided at one end, and having a flange at a base end portion of the insertion portion, and a header according to claim 5, wherein said insertion portion is inserted into a branch pipe portion. It is fitted so that the flange of the piping material and the flange of the branch pipe part are in close contact with each other, and the diameter is expanded and contracted by the tightening of the tightening screw, and the two flanges are arranged so as to be inserted. A fixed band with a part on the periphery,
A connection structure between a header and a piping material, wherein the piping material is connected to a branch pipe portion of the header in a state in which the flanges are mounted so as to surround the flanges and be sandwiched by the locking portions. 12. An insertion portion provided at one end of a pipe member is internally fitted into the branch tube portion of the header according to claim 6, and is rotatably externally fitted to the pipe member. A cap nut, which is locked to a flange of a pipe member arranged so as to face the front end surface, is screwed into a screw of the branch tube portion, so that the pipe member is connected to the branch pipe portion of the header. Connection structure between header and piping material. 13. The pipe material is a pipe connection joint.
A connection structure between the header and the piping material according to claim 12.